Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,061	$ 15,029	$ 45,787	$ 28,939
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on available for sale securities arising during the period	6,729	(3,998)	15,681	(15,024)
Change in minimum pension liability		80		160
Other comprehensive income (loss)	6,729	(3,918)	15,681	(14,864)
Comprehensive income	$ 29,790	$ 11,111	$ 61,468	$ 14,075